CVE-2025-11678 | BDVDB-2026-298601 Detail

warmcatlibwebsocket

Description#

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.

Impact#

CAPEC-100 Overflow Buffers

Weaknesses#

CWE-121 Stack-based Buffer Overflow

References#

Exploit#

No public exploit known

History#

Version 12025-10-20Record published in the CVE List.

Published

Published: 2025-10-20
Last modified: 2025-10-20

Vendor information

Vendor: warmcat
Product: libwebsocket

All warmcat vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 21.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 4.0 and <= 4.4.2
Fixed
Not stated
Vulnerable
>= 4.0 and <= 4.3.6
Fixed
Not stated

Scoring System

CVSS v4.0

7.5 High

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Adjacent
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	Passive
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).